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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b460e8976c113bbaa187306038f0e528753d073749b3bf799a19a4eb2552b26' 
  AND token = '+oRKq4xujIhydieY6eb0kS/FgqNaLK/VpbfNR05w1Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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