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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a2ea2f2c288cbb9b612db5b2529962a42cc0e5e6a27ff4d55e033666ac1a16f' 
  AND token = 'SIQHCJNkBhaqOj2LUYvnsMcghZVboEJH/2YT1KQ3alo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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