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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d8457491e4bbfa9a5122d6888eb87f25615079622950e45df08cece4d3976d' 
  AND token = 'm9t6FPJUkiRIQwKGWpG0kcmsE3qtqS69OETLi1AnVzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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