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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d19c71d14fca42962a595a7abe8876c379a4dd3bbba18ba689eb4ba3063f26c' 
  AND token = 'IEbgUcF6Gh/YBXCxLbjKmmaM+kl3ZYn3+dUIag1cgac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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