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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c394596cf8767c6ed26f627343ac2b1ea15ebb43a7c3bf630f27aa370260122d' 
  AND token = 'a1ODAoNamiAJAUGrrvjH0VuNA41+eTyDw99zGMG6xM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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