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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb4e3e09fa70bebcef5b83a34994139ea2115b668a85c15e9088ba2d23b65f6d' 
  AND token = 'Kcdq9yTbqPPD0vapWBQ0ckHLBwi4blr4wfb7C5Ng1SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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