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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0955e1d24749d4a54fac795201ea4f85c5a2be1076d7406e3d422ce4d7a7ae72' 
  AND token = 'TsBG1dYcLq64owgrNpnFBVGakgWqVMDwmH3U8l8tnBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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