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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9711ba6b5bb9bd3992515de15fb4f942299c0d45a1c511f985635562afe3d31' 
  AND token = '67qD7zQVDS6yeo5JdedR2sdJfeTqg75yIGY1QKhKSNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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