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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7bbc5150c2d1de41d41f64f9ff67c67ad9fea3e0b0b0366b49d95bd79810873' 
  AND token = 'TepkKHfDpFzI59ueIB/h7OPT+Mm2QwdHhvN2gre6ieM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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