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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8cec392a650c2a78397feb7e8788eb99dcb0449dd2a4bb1c96e212453bc77e' 
  AND token = 'DQRP153XWTYaUUFZj4c1vIGOZnpUhrDc+vdJA4Edcp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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