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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137672dfc3a17534b290b9ed56851538fa12a8e0112ef20ff392ed37714a03d8' 
  AND token = 'NhTc80jNjgEzcBDbaDIalZPEK5dqgSfsX1zxtg2P4+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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