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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '183fc815152c89a516d8a49342fd88c4abef3d071f38db631ff4a914f9e07a7b' 
  AND token = '5Lie8KbRgG59oWzpGanylPu1Is7ZR120Uoeb2qcOQNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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