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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4e1de1e01530d141f40e0f16345d80368421046e4ad091ef865882a97943104' 
  AND token = 'diyi8pYnjCtgV+xiqVCG/BDAq6uo7+9zb3Q1rX6y0h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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