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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9295a3ba77fdb54cb5592ff90a7ef0b9dc9d388268ca1de5530c71855122ea8c' 
  AND token = 'Sf9UQ94H8uP5iGYXOKIsw0qM897CMmwe3Ii/fnoBqKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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