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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46e4852bc124771e51c921c6555e4e324c55b105b7bad3b05298afec3da5ae08' 
  AND token = 'kfoVKF1szUR46v3KXE+cADhQp83Gfd9pR3x70SOMhMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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