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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a97018ada406baa0c0c763e53760876464e01f4a3b7600e689fec418c9d8c3e' 
  AND token = 'CuIz3XrXSMCbNS0CU+lV2q5bUj8Gpbk63j1sSg2q6DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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