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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c118692c0fc46479167ab2f13569355304a1bfb04245adc474fe2665d2a6dd' 
  AND token = 'tG5toaQeVrW6itANjrgI8pUaKYSX1FeleMQbfMR2rRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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