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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ac8c3f9a2037973508e7d67bd0b39638960bd49abc19f40c56a6ab0d3ba9d0' 
  AND token = '9a/5o4x93fXCFSQZnhBSxc22umuyLeZzHFET1Pv9SSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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