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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19af1c8487225c429936a61f02bb93d4f9778ab39e69d6e6fb9f9b51bb71d04c' 
  AND token = '2w05N+m5M18MJ5Uhb1oY2XS23gP9tFtMut6Pu3uETaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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