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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1caea9e82a629b55f0ab2c2cc5dbefda25edeae2bf5ede7f99715a6c40b7377' 
  AND token = 'cXJqyLaVBz77G1Nk3eRt0vxAIFV6923i/qsuJAeN+dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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