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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cf5dee68a1340eaf428aae518fac5b5036ef599be0cfc096d26f8409531f5a5' 
  AND token = 'ooZTrt2UmIKdQ0mDanUxoNNqk4efcsF7M02ODWs2JP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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