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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc81505f16f630d857764cb357083186f31f20296539a82ac0bc3b1b39c49773' 
  AND token = 'gDySuc0QPPfAvMz9QN0xWUUkJiZP0htwbTY79CTk2Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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