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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f479f37ef0053e2f2453cec009a7b0aebd6769f220c0e73ec571ada9c437943' 
  AND token = 'ceKP91Hg9Fuiq2plJOjIdmEI8NiL+l8XQgWADbIyYRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}