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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4320a498c481666ba20f9c576c9bc7cead5aa02f3c666d2075dcd98df3cafab2' 
  AND token = 'maSkWJmdGeka3AQPL5zj6w3sFzLSiVeV2/OM3EE7zeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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