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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a618f3a38bdcb1dc7c22ad8a94567c1c9f833410f2edb4f93184a7dac34962' 
  AND token = 'MUgdHa26yfTm9BpWViRLjgmOcLHkPIt/P7nAzSDHb6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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