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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa9003dd58a139ce5f2d32150ac3b69eb0e1440cb722a8964e0f9a2eb2d5fff' 
  AND token = '+6D9pjWqd1X3+kSebA8qGfzuwiM9J7Q9CeLfZoadVH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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