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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9daed6d6dfd9f993d2b70c90e8a32f2c0b1f31365af16dc1769901b3d0a9dfd7' 
  AND token = 'DhHKJUyJZiLGQ4wnI3+f+6sk58flOl4bJMVLakCafPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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