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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d8877451499269c4db0bafebcb7e9d20877afc7462df5b4af17d9cafc7cdf3d' 
  AND token = 'ZqTy62chgceT8Cu/x9n+B2tACjVbNOAmxKQDkXyeXJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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