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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adaabe3976a0927e2db69ad171d9688398a7c2d6794b45ce003874e7db0b951a' 
  AND token = 'fpjDeEt2E+KX6elMQkKlGKh9C3U1fQmMvbOQlbSqRhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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