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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7235859ba035f22f492637e46fb1756ccb94093031270e03ae4e0a4a05913d' 
  AND token = '4N6iwN5KRWWVdDvLBCPqMGSQ+T+nG65ie/Cy2ngtUW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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