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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee390834d4a1c8a50d1d080ea35308fbdd5f42eb238aca8461bdc14bf7f16ca' 
  AND token = '4NP1v50/WTRWcfqFjY1s8ZOxwbnyQk4b3qLzVmtq7os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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