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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea74f1148ee91d66221d0a1d78d81404fb2d30233c3c854c8a58c95bc9f5f1b' 
  AND token = 'xyrHTLdn18g63T+dn3Q1XOQkZshxytOUBO3KiFtFqlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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