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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a98d6f4abc1deba6ea91b8eda53de290903b2aaed4ee87ce92cb28654df6b6a' 
  AND token = '4lBLextK9igtQgcJ/0rrDnhlS1OJ7+0RTWJEHe1sZJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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