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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aae82fd6b9323f1528725b862d7231afcea562a88fe79fc84681b7e5930c285' 
  AND token = '2aed5q9jPZUhfex6WyvGCG9vdr3Gc00ttBWMCaQgtac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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