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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e37101c40fef4c02b4fe6cc829fe80326172f8b70f954643c0dd350b93a313f' 
  AND token = 'QsGomvS+3EAKOFSfmAxiMtqe3Jq4HMFR+awGsDRn6g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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