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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12be927036f2343cb1e31c2519cbcdf7b9d62ed77b61feac0338992bc95fbb6' 
  AND token = 'pk7BhUGDHWPK+BnAfcR7ykDEYa282tSFWc9ESZ6XNm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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