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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05618197cb99ebeb2bee79e117230f3dcd1492a59c5ea2e0a67fa8225d6bd175' 
  AND token = 'jukvZucOC1GtyJRB8w4bhJiJi0welBgAVUZgi02JCB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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