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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b9cd4bbf21cd62a023ef25810c9ec4d2741673f33d9b2d31699ccc56cf5e70' 
  AND token = '0hg76p8mYOoFYopku0c7Wvs/Ad0ObhmfGZZsQMYUNCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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