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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee95d15a24c8d0c7df7c992b946df2c42938504c0aafc4317f7529fc58c63f4' 
  AND token = 'hkJc67WWmXGpz36W1VndVRhZzasic8JtyyMCfp7ozpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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