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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771b8c7bc41a9ea54e21d307b2b0058db8b72bb35375dfe62752bed01789329d' 
  AND token = 'cAEw5gXV4ha49rC65xV9jiGlrkHiUzygz6CFvdB9JkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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