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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea4e0db0bde8e0741ad115a30cd6449e570546eafbc7fcf8942620d802c5db9' 
  AND token = 'nEXIT+QfgrqgdDbzEaKqm9g+zbJdprE3RqoFT1qzxM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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