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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac72b465f9813de91355a436bd1660c1ed66177ff55d54cfef7e3a207047bd3' 
  AND token = '23W6PeS8nyQ8fwaAnwOu6cfgss3hpBJ2n5+Pgi9quKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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