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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ec11fb0957a90c37ceb86b4b8d525b8318828db7e9084b3ae5a956639afdfd' 
  AND token = 'h4EPGEpVGS73wnZlYrAXy4+Z0kUcxc7jpwkchSWhY4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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