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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060ecdb53daf3d29efe08324977c4c78b397d1c3ec9b710130cb8b33d95a9dc2' 
  AND token = 'vP3Gm8y3faK/Px0BfLIhK21DVuXFrQbAgzyRllPZakI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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