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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5797e8b82397d53e9cd05c4b2ecb690679b2fc9fab6f4835c13dd1f5ba2ce327' 
  AND token = 'wNhGsUxe9EXLjMOyjAH6RgnOnoLejklxAZ7uSC1A+xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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