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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80417862ef6bf2ac8cf4ca0bda1953630672e6693eac3ea8586d9223558aea81' 
  AND token = 'mi2Xvf0p5H2rXwJ7AfI1yxA3CFUBBlp2qBO3AOM3BHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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