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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af911ee11257e69268d0cb4b4e3fa02bab88e11e944cd9909273cdb6dafdac6' 
  AND token = '02KFg9B9dcCxfjtEXS6x9JCZKlVHX3gdkT2rlNRSJE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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