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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af4c9cfafb0248cf760133b2fcf7e4028be09f54c3313888bec3790477a651a9' 
  AND token = 'nOteLVJgVnbC+Cb465CqHpZ1cuq9/JUJPeDefYK2ATI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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