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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3b1f248c62221a335c6c360b48e07a6759365a9cb1148167f8ed87d591c00a' 
  AND token = '80YwxQr4UnbgZYMCIdkmT5Jo8mjjhy56Fox9LoIKK4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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