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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '965bfdbe61f9b4b2622ccf218b071bc87e53ce92daccdeb08fe3731c4ffd4cb0' 
  AND token = '55VHT8ifmVOdLCz15m5Ij+23PiWYcLiwctbyQZkNy84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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