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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba05a1c5fe2ad897e8d3b980c91227ed1cab331ff487c6e942afdc3142b2af0' 
  AND token = 'cl+dLm45Fi4sAbpWNmywA+ZpbtnZc7dGDU0qOVknOOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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