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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a90cda49e86f5487cb7cbe734c25a9ab515c44bd650bfb2ffd9ee875d3e30ff' 
  AND token = 'RhVsfCrHhddT8VHDZdi+UilQBVt4jBr43GuPoIFYb+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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