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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9840f7650d843d377d36132e2332ec07f5cf2b5b7ff153d419eb81ec3213a81e' 
  AND token = 'i6pHj9qfpOKs88qdxLhIr51raqSl/878F90DVNkLjms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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